Write the linear system that corresponds to the given augmented matrix. use x 1x1 and x 2x2 to represent the terms from the first and second columns of the matrix, respectively. type the equation that corresponds to the first row in the first answer box, the equation that corresponds to the second row in the second answer box, and the equation that corresponds to the third row in the last answer box. 1 x 1 equals 71x1=7 nothing nothing (simplify your answers. type your answers in standard form.)